1 /* $NetBSD: rk_cru_mux.c,v 1.2 2018/06/30 17:54:07 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: rk_cru_mux.c,v 1.2 2018/06/30 17:54:07 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 35 #include <dev/clk/clk_backend.h> 36 37 #include <arm/rockchip/rk_cru.h> 38 39 const char * 40 rk_cru_mux_get_parent(struct rk_cru_softc *sc, 41 struct rk_cru_clk *clk) 42 { 43 struct rk_cru_mux *mux = &clk->u.mux; 44 const bool mux_grf = (mux->flags & RK_MUX_GRF) != 0; 45 uint32_t val; 46 47 KASSERT(clk->type == RK_CRU_MUX); 48 49 if (mux_grf) { 50 if (!HAS_GRF(sc)) 51 return NULL; 52 syscon_lock(sc->sc_grf); 53 val = syscon_read_4(sc->sc_grf, mux->reg); 54 syscon_unlock(sc->sc_grf); 55 } else { 56 val = CRU_READ(sc, mux->reg); 57 } 58 const u_int index = __SHIFTOUT(val, mux->mask); 59 60 return mux->parents[index]; 61 } 62 63 int 64 rk_cru_mux_set_parent(struct rk_cru_softc *sc, 65 struct rk_cru_clk *clk, const char *parent) 66 { 67 struct rk_cru_mux *mux = &clk->u.mux; 68 const bool mux_grf = (mux->flags & RK_MUX_GRF) != 0; 69 70 KASSERT(clk->type == RK_CRU_MUX); 71 72 if (mux_grf && !HAS_GRF(sc)) 73 return ENXIO; 74 75 for (u_int index = 0; index < mux->nparents; index++) { 76 if (strcmp(mux->parents[index], parent) == 0) { 77 const uint32_t write_mask = mux->mask << 16; 78 const uint32_t write_val = __SHIFTIN(index, mux->mask); 79 80 if (mux_grf) { 81 syscon_lock(sc->sc_grf); 82 syscon_write_4(sc->sc_grf, mux->reg, write_mask | write_val); 83 syscon_unlock(sc->sc_grf); 84 } else 85 CRU_WRITE(sc, mux->reg, write_mask | write_val); 86 87 return 0; 88 } 89 } 90 91 return EINVAL; 92 } 93